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Perhaps you could have a function called @Dblookup2 which would increase 64K limit. Developers could then go into their apps where they know they have considered backward compatibility and just switch to the "2" version of @Dblookup.
As a workaround, you can split the data into multiple (CFD) fields and use those in the choices field of the checkbox/radiobutton field. Of course if too much data is selected, you still are stuck
I'm reasonably certain they remain in order to provide backward compatibility. While I think most developers would welcome the removal of the limits, it may negatively impact existing apps that were created expecting those limits. I had suggested in another idea to add a document type that just supports storing data as JSON and getting rid of types and low limits.